The phrase "combat missions" refers to specific tasks or operations performed by military personnel to engage in warfare and fight against enemy forces. Full definition
Fight off increasingly difficult waves of enemies over a variety of combat mission types. (andyemulator.com)
As commander, you control your squad (s) in turn - based combat missions against alien enemies. (macgamerhq.com)
You will control the fate of the human race through researching alien technologies, creating and managing a fully operational base, planning combat missions and controlling soldier movement in battle. (nonfictiongaming.com)